Drafting appliance.



F. J. WINTERS, JR.

DRAFTING APPLIANCE.

APPLICATION FILED JUNE 12, 1911 1,013,086. Patented M026, 1911.

UNTTED STATES PATENT OFFICE.

FRANK J. WINTERS, m, on NEW YORK, N. Y., ASSIGNOR TO HIMSELF AND THOMAS H. KIP, or NEWYYORK, N. Y.

DRAFTING APPLIANCE.

Application filed. June 12, 1911. Serial No. 632,655.

longitudinal slots 6. The heads of the screws lie within the thickness of the tubewall so as not to obstruct the clear. circular interior of the tube. Within each tube is a cylindrical slide C matching the interior of the tube and adapted to be moved longitudi nally therein, and of a length suflicient to insure the required free sliding movement without cramping or binding. The slides may be of wood and cut from a cylindrical rod of proper diameter.

E E are brackets each having an arm E fastened to one of the slides C at about the mid-length of the latter and adapted to travel in the slot 7) as the slides are moved.

D is a strip of thin wood having its side edges true and parallel to serve as a ruler or straightedge, attached at the ends to the brackets E and arranged to be supported by the slides C in a position perpendicular to the guides B B. At the mid-height of the strip is a stud F on which is pivotally mounted one end of a blade F which may be of the same material as the strip D but preferably somewhat narrower and of a length about half that of the strip, and adapted to swing on the stud F through a complete circle and to stand at any desired an le in the plane of the board A. The

stralght-edge D is provided with a series of holes at, shown as equally spaced along its. length, and the blade F is similarly provided with holes f so spaced as to coincide with the holes at when the blade is in alinement with either end of the strip. Thus equipped vertical lines may be drawn with crayon or other medium upon the board along either edge of the strip D, and by: means of the attached slides C the strip may be moved to any part of the board, the lines thus produced being substantially vertical andparallel. To produce horizontal lines the crayon may be held in position on either edge of the strip and the latter then moved along the board with the crayon in contact therewith, or the crayon may be inserted in one of the holes (Z, or through coincident holes d and f in both the strip and blade, and the strip moved as before. Angular lines are produced along the edges of the blade F which may be set at any desired angle, and circles or arcs thereof are drawn by inserting the crayon in one of the holes f and revolving the blade upon the stud F G G are braces extending angularly from To all whom it may concern;

Be it known that I, FRANK J. WINT RS, Jr., a citizen of the United States, residlng in the city of New York, borough of Bronx, county and State of New York, have invented a certain new and useful Improvement in Drafting Appliances, of which the following is a specification.

The invention relates to devices adapted to aid in producing right lines, straight and angular, and circular curves, upon a rafting surface, and is designed more particularly for service with blackboards in schools and like situations.

The object of the invention is to provide simple, inexpensive, and easily operated means by which geometrical designs an other drawings and diagrams may b o duced upon the blackboard with less labor and greater accuracy than by ordinary methods.

The invention consists in certain novel features of construction and arrangement by which the above object is attained, to be hereinafter described and pointed out in the claim.

The accompanying drawings form a part of this specification and show an approved form of the invention.

Figure 1 is an elevation of a blackboard equipped with the invention. The remaining figures are on a larger scale and show details of construction. Fig. 2 is an elevation showing the upper end of the vertical straight-edge or ruler and a portion of one of the horizontal guides in which the straight-edge is mounted to move. Fig. 3 is a corresponding view with the guide in vertical section to show one of the slides to which the straight-edge is attached. Fig. 4 is a side elevation partly in transverse section taken on the line H in Fig. 2

Similar letters of reference indicate the same parts in all the figures.

A is the blackboard, shown as the surface of the wall of the room but which may be of the portable type adapted to be suitably supported for service. Along theupper and lower margins of the board are guides shown as tubes slotted on the outer face as at b and extending parallel with each other. The tubes are securedto the wall, or to the frame of a portable board, by screws B received in countersunk holes on the interior of the tubes, and introduced through the the sides of the brackets E to the extremities of the adjacent slide D and servlng to hold the latter stiflly at a right angle to the strip. The stud F is preferably extended outwardly and shaped to serve as a handle F by which the strip and its connected parts may be moved conveniently along the board, and the joint between the blade and strip should be sufliciently stiff frictionally to insure the maintenance of the blade in any angular position at which it may be set.

The Whole forms a simple and efiicient device, easily the apparatus, and although the invention is described as applied to a wall-blackboard it will be understood that it will serve successfully in other situations and for other purposes to which it may be adapted.

I claim z- Tubular longitudinally slotted guides, cylindrical strips movable therein, a ruler strip extending between said guides, brackets attached to the ends of the ruler strip and having arms extending through the slots of the guides, braces connecting said their ends working in said slots, said ruler strip being provided with holes, and a blade pivoted at one end to the ruler strip between its ends and having holes, said ruler strip and blade being adapted for the marking of vertical longitudinal and circular lines.

In testimony that I claim the invention above set forth I affix my signature, in presence of two witnesses.

FRANK J. WVINTERS, J R.

Witnesses:

CHARLES R. SEARLE, CoRA M. FRnDERIcKs.

greatly facilitated.

Modifications may be made in the formsand proportions of the parts within wide limits without departing from the invention, and parts may be used without the whole.

The slotted tubes shown as the guides are preferred on account of accuracy and economy but other forms of guideways with corresponding slides adapted to cooperate therewith may be employed.

The strip D and blade F may be of metal, preferably aluminum, as may other parts of Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. G.

brackets and cylindrical strips and having 40 

